<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>测试</title>

    <script type="text/javascript" src="jquery.min.js">
    </script>
</head>
<body>
    <p id="message">click the button to hide me</p>
    <button type="button" onclick="$('p').toggle();">toggle the message</button>
</body>
</html>